Improvement in spark-arresters



n; ALLARD. SPARK-ARRESTER.

Patented Dec. 28,,1875.

UNITED STATES PATENT rnen.

DERRICK ALLARD, OF ST. ALB'ANS, VERMONT.

IMPROVEMENT IN SPARK-'ARRESTERS.

Specification forming part of Lettere Patent No. 171,594, dated December28, 1875; application filed March 8, 1875.

To all whom it may concern:

Be it known that I, DERRICK ALLARD, of St. Albans, in the county ofFranklin, State of Vermont, have invented a new and Improved Smoke-Stackaud I do hereby declare that the following` is a full, clear, and exactdescription of the same, reference being had to the accompanying drawingforming a part of this specitication. g

The invention relates to an im provement in the class of smoke-stacksfor locomotives in which a vertically-adj ustable tube is elnployed toregulate the draft.

The invention is au improvement upon the smoke-stack described invLetters Patent N o. 39,727 land consists in the construction andarrangement hereinafter described and claimed.

Figures 1 and 2 are side elevations, showing the ad just-abledraft-regulating tube in different positions. Fig. 3 is a bottom-planview; and Fig. 4, a Vertical section of the spark-arrester and theconical deflector, detached.

The lower portion of the casing or outer tube A of the smoke-stack isconstructed with parallel sides, a'nd provided with the usual form ofwire hood L; The inner tube B has also parallel sides, and isof suchsize that a considerable space is left between it and the casing A. Itis provided with a flange, O, on

its upper end, which is turned downward, and a double-beveled or V-shaped ring, T, is at tached to its lower end. Said tube is adjustedvertically by means of a rack, I, 'piniou D, and crank E, and is guidedin its Vertical movement by rods G Gr and S S, the latter working inkeepers a a, which are attached to the innersde of casing A.

It results from this construction and arrangement of parts that thecinders and spar-ks carried up by the blast pass entirely through theinner tube B, being prevented from entering the space between it and the'casing A by the beveled ring T, and first strike the twopart cone N y,whereby they are diverted outward against the under side of arrester K,and are by it turned in both directions, outward and downward and inwardand downward, as

represented by the arrows in Figs. 1, 2. The

inward current is again deflected upward by the cap y of the cone, andescapes between it and the base portion N. The outward current iscarried down between the inner tube B and casing A, and diverted by thebeveled ring into the main current, by which 'the now broken cinders areagain carried upward against :the cone N y. This Operation goes on untilthe cinders become so reduced as to enable theln'to 'escape with theblast through the hood L.

It will be seen that the beveled ring per'- forms an important function,in connection with the adjustable tube, in rthat it controls .thedisposition or direction of the cinders,

both in their upward movement and descent, and prevents the blastentering the annular space be'tweeuthe tubes, whatever may be theadjustlneut .of the tube A. This feature, in conjunction With therelative form and arrangement of said tubes, enables a suppleinentarytube, such as shown in Patent No.

39,727, to be dispensed with.

The concave spark-arrester K and'conical defiector N y are attached toand supported by stationary uprights G G.

The tube B may be adjusted upward to meet, or nearly meet, the loweredge of the arrester K, and thus close, or nearly close, thel usual exitfor exhaust steam and products of combustion. In such case the latterwill find exit through the annular space between the tubes. The draftmay be thus perfectly controlled.

What I claim isl The combination, with the casing A and thevertically-adjustable tube B, having parallel sides, and thebeveled'ring T, attached to the latter, so that it may be adjustedtherewith, as shown and described.

DERRICK ALLARD.

In presencc of H. F. SrEvENs, H. B. LEwsANr.

